... JIS S20C),45#(JIS S45C), 16mn(STS49,STPT49) etc.c. ASTM/AISI Standard10#(ASTM a106/53 Gr.B,A192, ... -A-1,A315-B,AISI1020),45#(AISI1045), 16mn(ASTM A210-C) etc.Usageboiler use,water transport, building, machinery, traffic, ... and mark on the pipepayment termT/T or L/C at sight.Methodcold drawning, hot rolling or hot expanding ... hesitate to let us know, thanks ASTM A106 Grade B carbon seamless steel pipe